Portion of an engine



FIG. 1 is a front plan view of a portion of an engine according to an embodiment of the present invention;

FIG. 2 is a left side elevation view of the portion of an engine shown in FIG. 1;

FIG. 3 is a perspective view of the portion of an engine shown in FIG. 1;

FIG. 4 is a right side elevation view of the portion of an engine shown in FIG. 1;

FIG. 5 is a top plan view of the portion of an engine shown in FIG. 1; and,

FIG. 6 is a rear plan view of the portion of an engine shown in FIG. 1.

The broken lines shown herein are for illustative purposes only and form no part of the claimed design. 

The ornamental design for portion of an engine, as shown and described. 